几种外源物质对大田香蕉抗寒能力的调控效应

Chemical Regulating Effects of Several Exogenous Substances on Cold Resistance of Field Banana Tree

用多肽、肌醇、磷酸二氢钾不同浓度组合喷施大田香蕉植株3d后,剪取部分叶片用湿纱布包裹放入人工气候箱中模拟自然寒害胁迫,以探索该三种外源物质对大田香蕉抗寒能力的调控效应。结果表明,多肽、肌醇和磷酸二氢钾混合处理可提高香蕉叶片的比叶鲜重,降低低温胁迫下香蕉叶片的比面失重速率,减轻低温对香蕉叶片的伤害率,维持较高浓度的叶绿素含量。就单因子水平而言,0.5%多肽处理效果极显著优于0.4%和0.6%两水平;6.0μmol/L肌醇显著优于4.0μmol/L和5.0μmol/L两水平,0.25%和0.3%磷酸二氢钾显著优于0.5%水平,但该两者间无显著差异。多肽、肌醇和磷酸二氢钾混合处理中,以0.5%多肽+6.0μmol/L肌醇+0.25%磷酸二氢钾处理效果最佳。

For study the chemical regulating effects of polypeptide, inositol and monopotassium phosphate on the cold resistance of field banana tree, the banana trees were sprayed with different content of these three substances. Three days later, after being cut off and then wraped up with wettish gauze, the middle part of the banana leaves were stressed under low tempreature in the artificial bioclimatic chamber. The results indicated that after being treated with polypeptide, inositol and monopotassium phosphate, the specific area weight of banana leaves was increased, the weight loss ratio of specific area and the injury ratio of banana leaves under low temperature stress declined, the banana leaves keep hight content of chlorophyll. In single factor level, the effect of 0.5% polypeptide was very significant better than 0.4% and 0.6% levels, the effect of 6.0 μmol/L inositol was significant better than 4.0μmol/Land 5.0μmol/L, 0.25% and 0.3% monopotassium phosphate were significant better than 0.5% content, but there was no significant difference between 0.25% and 0.3% monopotassium phosphate. In three factor Levels of polypeptide, inositol and monopotassium phosphate on enhancing the ability of cold resistance of field banana tree, the best combination is 0.5% polypeptide＋ 6.0μmol/L inositol＋ 0.25% monopotassium phosphate.